H2H data updated: 2026-09-12 00:00 UTC
Dayeon Back holds a 1–0 lead over Jelena Ostapenko in their WTA head-to-head. Across 1 main-draw meeting, Dayeon Back leads 1–0 on hard courts. Most recently, Dayeon Back won the 2023 Korea Open first round 3-6 6-1 7-6(4).
Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Dayeon Back | 3-6 6-1 7-6(4) | Jelena Ostapenko | Match data | Oct 12, 2023* | R32 | Korea Open | WTA 250 | Hard |
Estimated match date where the exact historical date is unavailable. Arrows show an edition's recorded category and documented modern equivalent; unresolved editions keep their recorded category. Asterisked totals include editions mapped from documented historical predecessor categories. Mapping details.
| Player | Current | Peak | Pts | Elo | W | L | Win % | GS | 1000 including documented historical predecessor categories | Finals | 500 including documented historical predecessor categories | 250 including documented historical predecessor categories | Titles |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jelena Ostapenko | #32 | #5 | 5,611 | 2,022 | 293 | 219 | 57.2% | 1 | 0 | 0 | 5 | 3 | 9 |
| Dayeon Back | #268 | #245 | 299 | 1,541 | 1 | 4 | 20.0% | 0 | 0 | 0 | 0 | 0 | 0 |
Seasons are aligned by the age each player spent most of that calendar year. GS and Titles are cumulative career totals through that season.
| Age | Jelena Ostapenko | Dayeon Back | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 17 | 2014 | 1–1 | 50.0% | #271 | 1,505 | 0 | 0 | — | — | — | — | — | — | — |
| 18 | 2015 | 6–5 | 54.5% | #84 | 1,563 | 0 | 0 | — | — | — | — | — | — | — |
| 19 | 2016 | 20–24 | 45.5% | #44 | 1,587 | 0 | 0 | — | — | — | — | — | — | — |
| 20 | 2017 | 43–20 | 68.3% | #7 | 1,904 | 1 | 2 | 2022 | 0–1 | 0.0% | #609 | 1,512 | 0 | 0 |
| 21 | 2018 | 23–21 | 52.3% | #22 | 1,764 | 1 | 2 | 2023 | 1–1 | 50.0% | #457 | 1,526 | 0 | 0 |
| 22 | 2019 | 25–26 | 49.0% | #45 | 1,796 | 1 | 3 | 2024 | 0–1 | 0.0% | #316 | 1,506 | 0 | 0 |
| 23 | 2020 | 8–7 | 53.3% | #44 | 1,794 | 1 | 3 | 2025 | 0–1 | 0.0% | #307 | 1,501 | 0 | 0 |
| 24 | 2021 | 31–19 | 62.0% | #28 | 1,885 | 1 | 4 | — | — | — | — | — | — | — |
| 25 | 2022 | 31–19 | 62.0% | #18 | 1,842 | 1 | 5 | — | — | — | — | — | — | — |
| 26 | 2023 | 38–22 | 63.3% | #13 | 1,904 | 1 | 6 | — | — | — | — | — | — | — |
| 27 | 2024 | 29–18 | 61.7% | #15 | 1,821 | 1 | 8 | — | — | — | — | — | — | — |
| 28 | 2025 | 17–19 | 47.2% | #23 | 1,768 | 1 | 9 | — | — | — | — | — | — | — |
| 29 | 2026 | 21–18 | 53.8% | #32 | 1,806 | 1 | 9 | — | — | — | — | — | — | — |
Seasons are aligned by the age each player spent most of that calendar year. Results cover completed main-draw matches. Bold green marks the higher win percentage when both players have at least 5 matches on that surface at the aligned age.
| Age | Jelena Ostapenko | Dayeon Back | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Hard | Clay | Grass | Yr | Hard | Clay | Grass | |||||||||||||||||||
| W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | |||
| 17 | 2014 | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 18 | 2015 | 5 | 4 | 9 | 55.6% | — | — | — | — | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 19 | 2016 | 13 | 16 | 29 | 44.8% | 2 | 4 | 6 | 33.3% | 5 | 4 | 9 | 55.6% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 20 | 2017 | 22 | 14 | 36 | 61.1% | 16 | 4 | 20 | 80.0% | 5 | 2 | 7 | 71.4% | 2022 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 21 | 2018 | 13 | 15 | 28 | 46.4% | 3 | 4 | 7 | 42.9% | 7 | 2 | 9 | 77.8% | 2023 | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — |
| 22 | 2019 | 18 | 16 | 34 | 52.9% | 3 | 7 | 10 | 30.0% | 4 | 3 | 7 | 57.1% | 2024 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 23 | 2020 | 4 | 4 | 8 | 50.0% | 4 | 3 | 7 | 57.1% | — | — | — | — | 2025 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 24 | 2021 | 18 | 13 | 31 | 58.1% | 5 | 4 | 9 | 55.6% | 8 | 2 | 10 | 80.0% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 25 | 2022 | 22 | 13 | 35 | 62.9% | 1 | 3 | 4 | 25.0% | 8 | 3 | 11 | 72.7% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 26 | 2023 | 23 | 16 | 39 | 59.0% | 7 | 4 | 11 | 63.6% | 8 | 2 | 10 | 80.0% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 27 | 2024 | 18 | 10 | 28 | 64.3% | 6 | 5 | 11 | 54.5% | 5 | 3 | 8 | 62.5% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 28 | 2025 | 8 | 14 | 22 | 36.4% | 9 | 4 | 13 | 69.2% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 29 | 2026 | 9 | 11 | 20 | 45.0% | 7 | 5 | 12 | 58.3% | 5 | 2 | 7 | 71.4% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 174 | 147 | 321 | 54.2% | 63 | 47 | 110 | 57.3% | 56 | 25 | 81 | 69.1% | — | 1 | 4 | 5 | 20.0% | — | — | — | — | — | — | — | — |
Seasons are aligned by the age each player spent most of that calendar year. Detailed serve and return statistics available for 477/514 of Jelena Ostapenko's and 5/5 of Dayeon Back's main draw matches. Sample is shown as matches with detailed serve and return statistics / total main draw matches. Bold green marks the stronger value when both stat samples contain at least 5 matches; lower is better for DFs/M.
| Age | Jelena Ostapenko | Dayeon Back | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Sample | Aces/M | DFs/M | 1st Sv% | 1st Pts% | 2nd Pts% | BP Saved% | BP Conv% | Svc Pts% | Ret Pts% | Yr | Sample | Aces/M | DFs/M | 1st Sv% | 1st Pts% | 2nd Pts% | BP Saved% | BP Conv% | Svc Pts% | Ret Pts% | |
| 17 | 2014 | 2/2 | 2.5 | 7.5 | 50.3% | 64.2% | 40.8% | 59.2% | 46.9% | 52.5% | 47.0% | — | —/— | — | — | — | — | — | — | — | — | — |
| 18 | 2015 | 4/11 | 2.3 | 8.8 | 51.3% | 68.6% | 37.4% | 46.0% | 55.6% | 53.2% | 42.9% | — | —/— | — | — | — | — | — | — | — | — | — |
| 19 | 2016 | 41/44 | 3.2 | 6.0 | 55.9% | 63.9% | 44.3% | 46.5% | 47.3% | 55.3% | 47.0% | — | —/— | — | — | — | — | — | — | — | — | — |
| 20 | 2017 | 57/63 | 3.0 | 6.0 | 52.4% | 66.3% | 44.4% | 52.2% | 49.7% | 55.7% | 47.9% | 2022 | 1/1 | 0.0 | 2.0 | 61.5% | 41.7% | 40.0% | 16.7% | 0.0% | 41.0% | 29.3% |
| 21 | 2018 | 41/44 | 3.2 | 6.0 | 53.7% | 62.2% | 43.2% | 44.4% | 53.4% | 53.9% | 45.0% | 2023 | 2/2 | 2.0 | 3.0 | 54.5% | 51.0% | 38.7% | 48.8% | 27.3% | 45.5% | 39.0% |
| 22 | 2019 | 50/51 | 2.6 | 8.5 | 54.2% | 65.5% | 40.4% | 49.4% | 49.8% | 53.8% | 44.9% | 2024 | 1/1 | 0.0 | 2.0 | 55.0% | 54.5% | 25.9% | 40.0% | 22.2% | 41.7% | 42.6% |
| 23 | 2020 | 15/15 | 2.1 | 6.7 | 56.0% | 63.0% | 42.4% | 52.5% | 56.4% | 54.3% | 47.8% | 2025 | 1/1 | 0.0 | 7.0 | 55.2% | 59.5% | 30.0% | 33.3% | 23.1% | 46.3% | 46.9% |
| 24 | 2021 | 48/50 | 2.3 | 4.9 | 59.2% | 65.5% | 44.8% | 47.2% | 51.4% | 57.3% | 47.9% | — | —/— | — | — | — | — | — | — | — | — | — |
| 25 | 2022 | 50/50 | 3.3 | 4.5 | 58.7% | 65.7% | 46.0% | 51.8% | 50.2% | 57.5% | 45.7% | — | —/— | — | — | — | — | — | — | — | — | — |
| 26 | 2023 | 59/60 | 3.9 | 4.8 | 57.7% | 67.9% | 44.8% | 53.0% | 51.2% | 58.0% | 45.4% | — | —/— | — | — | — | — | — | — | — | — | — |
| 27 | 2024 | 46/47 | 4.2 | 5.5 | 58.2% | 67.2% | 44.3% | 53.9% | 47.3% | 57.6% | 44.9% | — | —/— | — | — | — | — | — | — | — | — | — |
| 28 | 2025 | 26/38 | 3.8 | 6.3 | 56.3% | 64.1% | 42.6% | 45.4% | 52.0% | 54.8% | 44.0% | — | —/— | — | — | — | — | — | — | — | — | — |
| 29 | 2026 | 38/39 | 3.6 | 5.9 | 57.5% | 68.9% | 39.9% | 53.8% | 55.6% | 56.7% | 44.6% | — | —/— | — | — | — | — | — | — | — | — | — |
| Career | — | 477/514 | 3.2 | 5.9 | 56.3% | 65.8% | 43.5% | 50.2% | 50.8% | 56.1% | 45.9% | — | 5/5 | 0.8 | 3.4 | 56.1% | 51.5% | 34.7% | 37.5% | 20.0% | 44.0% | 39.4% |
Seasons are aligned by the age each player spent most of that calendar year. Metrics use eligible main-draw results; point statistics use matches with detailed data. Bold green marks the stronger value when both underlying samples are sufficient. Lower is better for Schedule because a negative value means a tougher schedule. Career Schedule is normalized per 100 matches.
| Age | Jelena Ostapenko | Dayeon Back | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Pressure+ | Schedule | Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Pressure+ | Schedule | |
| 17 | 2014 | 1506 | 102.9 | -0.95 | -1.08 | 0.989 | 49.6% | — | — | — | 50.0% | 0.00 | — | 0–1 | — | +0.07 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 18 | 2015 | 1564 | 113.6 | -0.38 | -0.84 | 0.917 | 48.0% | +1 | — | — | 51.9% | +0.15 | 3–2 (60%) | 2–0 | — | +0.31 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 19 | 2016 | 1587 | 129.6 | -0.26 | +3.66 | 1.052 | 51.1% | -18 | -56 | +58 | 47.0% | -0.01 | 5–9 (36%) | 6–2 (75%) | 100.1 | +0.42 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 20 | 2017 | 1905 | 140.7 | -0.06 | +4.38 | 1.081 | 51.7% | -121 | -14 | -156 | 61.0% | +0.69 | 19–7 (73%) | 8–7 (53%) | 113.0 | -0.70 | 2022 | 1512 | 97.1 | -1.57 | -1.15 | 0.496 | 35.0% | — | — | — | 0.0% | -5.00 | — | — | — | +0.26 |
| 21 | 2018 | 1765 | 135.8 | -1.97 | +1.80 | 0.976 | 49.4% | -46 | +60 | +98 | 52.5% | -0.15 | 5–6 (45%) | 11–3 (79%) | 104.3 | +1.89 | 2023 | 1527 | 103.2 | -0.33 | -0.69 | 0.715 | 42.4% | — | — | — | 40.0% | -1.60 | 1–0 | 1–0 | — | -0.06 |
| 22 | 2019 | 1797 | 138.3 | -2.06 | +2.13 | 0.973 | 49.4% | -6 | -63 | +57 | 49.5% | -0.12 | 10–7 (59%) | 6–2 (75%) | 105.6 | +0.41 | 2024 | 1507 | 95.1 | -1.39 | -0.55 | 0.731 | 42.2% | — | — | — | 0.0% | -3.50 | — | — | — | +0.37 |
| 23 | 2020 | 1795 | 129.8 | -1.03 | +3.31 | 1.046 | 51.1% | -14 | -42 | — | 50.0% | +0.33 | 1–1 | 0–2 | — | -0.12 | 2025 | 1501 | 102.7 | -2.49 | -0.83 | 0.873 | 46.6% | — | — | — | 0.0% | -2.50 | — | — | — | -0.02 |
| 24 | 2021 | 1886 | 145.5 | +0.96 | +4.80 | 1.122 | 52.4% | -58 | -102 | +128 | 60.3% | +0.78 | 10–10 (50%) | 6–4 (60%) | 101.7 | -0.11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 25 | 2022 | 1842 | 151.3 | +0.61 | +3.32 | 1.076 | 51.7% | +25 | -134 | +215 | 56.9% | +0.71 | 12–8 (60%) | 5–6 (45%) | 97.1 | +0.07 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 26 | 2023 | 1905 | 154.5 | +1.65 | +2.98 | 1.082 | 51.8% | -12 | -121 | +196 | 58.2% | +0.74 | 19–11 (63%) | 5–6 (45%) | 106.0 | -0.43 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 27 | 2024 | 1821 | 149.7 | +0.73 | +1.92 | 1.057 | 51.4% | +46 | -10 | +294 | 58.3% | +0.57 | 9–5 (64%) | 7–3 (70%) | 103.5 | +1.64 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 28 | 2025 | 1769 | 150.6 | -1.17 | +1.25 | 0.972 | 49.2% | -34 | +155 | — | 45.8% | +0.11 | 7–4 (64%) | 2–5 (29%) | 99.3 | +0.73 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 29 | 2026 | 1807 | 143.7 | -0.47 | +1.17 | 1.030 | 50.5% | -68 | +101 | +265 | 54.9% | +0.32 | 7–8 (47%) | 2–3 (40%) | 98.1 | +2.03 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 2022 | 149.7 | -0.12 | +2.85 | 1.045 | 51.0% | -27 | -7 | +135 | 54.9% | +0.40 | 107–78 (58%) | 60–44 (58%) | 108.9 | +1.22 | — | 1542 | 99.2 | -1.22 | -0.78 | 0.703 | 41.7% | — | — | — | 18.2% | -2.73 | 1–0 | 1–0 | — | +11.00 |
Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Karolina Pliskova | 6 | 5 | 11 | Jan 5, 2024 | H2H |
| Ekaterina Alexandrova | 6 | 4 | 10 | Feb 10, 2026 | H2H |
| Petra Kvitova | 4 | 6 | 10 | Mar 13, 2023 | H2H |
| Sorana Cirstea | 4 | 4 | 8 | May 12, 2026 | H2H |
| Daria Kasatkina | 5 | 2 | 7 | Jan 13, 2024 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Beatriz Haddad Maia | 0 | 1 | 1 | Sep 17, 2025 | H2H |
| Carol Zhao | 0 | 1 | 1 | Sep 19, 2024 | H2H |
| Kimberly Birrell | 0 | 1 | 1 | Oct 13, 2023 | H2H |
| Jelena Ostapenko | 1 | 0 | 1 | Oct 12, 2023 | H2H |
| Na Lae Han | 0 | 1 | 1 | Sep 22, 2022 | H2H |